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Foam is just a mass of small bubbles formed in or on a liquid.
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As a wave breaks onto a beach the water is aerated. The water then travels up the beach as swash - bubbles form in/on the water. The bubbles are then compacted into a foam. More bubbles are then pushed into the foam mass from another swash - the 'life' of these bubbles depends on the consistency of the water*.
* Put it simply, if you put more bubble bath into a tub, the bubbles generated in that tub will last longer than bubbles generated in a tub with little bubble bath. 
Hehe.
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Hope I'm right. 
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Replying to:
why is there foam formed?
